This article introduces the application of temperature difference closed-loop control composed of frequency converter, PLC, digital-to-analog conversion module, temperature module, temperature sensor, etc. in the energy-saving transformation of central air-conditioning system. Through temperature difference closed-loop control, the chilled water pump and cooling water pump can automatically change speed with the change of air-conditioning load, which greatly optimizes the operation quality of the system and achieves significant energy-saving effect.
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